Here are another 2 issues I found that may affect the borderless performance:

If you have DPI scale set in display settings to anything other than 100% do the following:Right click on the shortcut to attract or on the attract.exe and tick disable DPI scaling on the compatibility tab, orset the DPI override to "Aplication" (the options may vary depending on the version of Windows)

If your desktop resolution does not match the native resolution of the display it can also hinder the performance of the borderless mode. You can fix it by setting "GPU Scaling" in your driver settings.

By doing this you adding an extra framebuffer so when AM reads the snap from the disk it has 32ms instead of 16msto update the images. That makes the animations much smoother.

Or just use Full Screen if you can and you do not have issues with it like screen flashing on launching games